The green python connections tend to get brittle over time and break fairly easily. I go through one every few months at work because employees are hard on it. I have gone through quite a few at my house too..
I purchased the new Aqueon unit, because I wrote one off at work and -seemed- to like it. It's great if you have pressure issues with your tap, but I didn't like the fact that it seemed to get clogged easier when syphoning larger particles. However, it seemed like a much sturdier piece of equipment, but I still managed to break it somehow.
ANYWAYS
Tip of the year right here..
I took the extra parts from my python drainer, and the extra parts from my aqueon drainer.. and COMBINED THEM! Its this funky green/gray piece, that is extra durable, and locked together tight enough to the point where the piece that usually breaks is well secure.. It syphons well, seems to have more suction, and handles those large particles okay. (might take a few in/out blasts to break up particles, but with added pressure this is easier.)